# Scrap Rate Calculator

> Work out the share of units started that had to be discarded.

Page: https://freecalculator.tech/tools/scrap-rate-calculator
Last reviewed: 2026-09-16

## Formula

Scrap rate = (Units scrapped ÷ Units started) × 100

- Scrap rate = (Units scrapped ÷ Units started) × 100.
- Inputs used: Units started, Units scrapped, Units reworked (optional).
- Edge handling: Units started is required.; Units started cannot be negative.; Units started must be no more than 1000000000000.; Units scrapped is required.; Units scrapped cannot be negative..

## Inputs

- Units started
- Units scrapped
- Units reworked (optional)

## Worked example: 96 units scrapped out of 4,800 started

Rework is counted separately from scrap.
1. Start with Units started: 4800, Units scrapped: 96, Units reworked (optional): 0.
2. Apply the method: Scrap rate = (Units scrapped ÷ Units started) × 100.
3. Rework is counted separately from scrap.

## Common questions

### Where does this formula come from?

ASQ quality resources, waste measures: scrap counts units discarded, distinct from units reworked. See the source link on this page.

### What kind of calculation is this?

Units discarded as a percentage of units started, with reworked units reported separately. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### What are its limits?

A unit reworked and then scrapped should be counted once, as scrap; the calculator cannot detect double counting. Arithmetic over the counts entered — it cannot tell whether the inspection behind them was complete or consistent.

### How do I use the Scrap Rate Calculator?

Enter the required values for Units started, Units scrapped, Units reworked (optional). The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the Scrap Rate Calculator use?

Scrap rate = (Units scrapped ÷ Units started) × 100 The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### Can the Scrap Rate Calculator be used for exact decisions?

Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.

## Limitations and assumptions

- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this scrap rate calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- American Society for Quality — https://asq.org/quality-resources/process-capability

## Cite this page

- APA: Free Calculator. (2026, September 16). Scrap Rate Calculator. https://freecalculator.tech/tools/scrap-rate-calculator
- MLA: "Scrap Rate Calculator." Free Calculator, 16 Sept. 2026, https://freecalculator.tech/tools/scrap-rate-calculator.
- Link: Scrap Rate Calculator — Free Calculator, https://freecalculator.tech/tools/scrap-rate-calculator